lol........there's different degrees of heat you can use to release the smoke from the resin from the Volcano. Some people turn it down low, barely getting anything worth while in the bag and using the bud material numerous times to fill the bag. Me, I turn that bad boy up to 10 and get a bag deep with white smoke BUT, you can probably only do that twice and the product becomes dead. It's a fine art. lol
The replacement bags can be expensive, as they get dirty and sticky pretty quickly. I often use those turkey basting bags, which work fine too but can be odd shaped and will take some getting used to. I've had mine device a very long time, maybe close to 20 years now, and have never had 1 issue with it. Works are good as day 1.
But, as most know, it's not portable and something that's easily hauled around. As i've just started smoking a bit again after 3+ years off, i had given ever single piece of smoking apparatus i had away.....some expensive ROOR bongs too. I would never get rid of this, I'll be buried with it.